public ActionResult AddCohortUsers(CohortUsers users)
 {
     db.addCohortUsers(users.getIdsToAdd(), users.ProgramCohortID);
     return RedirectToAction("CohortUsers", new { ProgramCohortID = users.ProgramCohortID });
 }
        /////////////////////////////////////////////////////////////////////////////////////////
        public ActionResult Index(string Command, CohortUsers users = null, int ProgramCohortID = 0)
        {
            if (Command == "AddUsers")
                db.addCohortUsers(users.getIdsToAdd(), users.ProgramCohortID);
            else if (Command == "RemoveUsers")
                db.removeCohortUsers(users.getIdsToRemove(), users.ProgramCohortID);

            IEnumerable<ProgramCohort> model = db.getCohorts();
            ViewBag.ProgramCohortID = ProgramCohortID;

            return View(model);
        }